Detailed descriptions 17.5 System resources
17.5.2System resources used by the BIOS/DOS
The following table describes the system resources for the factory state of the device.
17.5.2.1I/O address allocation
I/O address (hex) | Size | Description of the basic function | Possible alternative | |
|
| (bytes) |
| function |
from | to |
|
|
|
0000 | 000F | 16 | DMA controller |
|
0010 | 001F | 16 | Motherboard resources |
|
0020 | 0021 | 2 | Programmable interrupt controller |
|
0022 | 003F | 30 | Motherboard resources |
|
0040 | 0043 | 4 | System timer |
|
0044 | 005F | 28 | Motherboard resources |
|
0060 | 0060 | 1 | Keyboard controller |
|
0061 | 0061 | 1 | System loudspeaker |
|
0062 | 0063 | 2 | Motherboard resources |
|
0064 | 0064 | 1 | Keyboard controller |
|
0067 | 006F | 9 | Motherboard resources |
|
0070 | 0075 | 6 | System |
|
0076 | 0080 | 138 | Motherboard resources |
|
0081 | 008F | 15 | DMA controller |
|
0090 | 009F | 16 | Motherboard resources |
|
00A0 | 00A1 | 2 | Programmable interrupt controller |
|
00A2 | 00BF | 30 | Motherboard resources |
|
00C0 | 00DF | 32 | DMA controller |
|
00E0 | 00EF | 16 | Motherboard resources |
|
00F0 | 00FE | 15 | Numeric data processor |
|
0100 | 016F | 112 | Unused |
|
0170 | 0177 | 8 | Secondary EIDE channel |
|
0178 | 01EF | 120 | Unused |
|
01F0 | 01F7 | 8 | Primary EIDE channel | Switchable in Setup, then |
|
|
|
| free |
01F8 | 01FF | 116 | Unused |
|
0200 | 0273 | 16 | Reserved for game port |
|
0274 | 0277 | 4 | ISA PNP Read Data Port |
|
0279 | 0279 | 4 | ISA PNP Read Data Port |
|
027C | 02E7 | 108 | Unused |
|
SIMATIC Panel PC 877 | |
Operating instructions, Release 07/2006, |
